A mining support to support rectangular dog headings

A mining support to support rectangular dog headings, with a straight frame and a roof-bar element supported by two props. It is characterised in that it has an internal hook frame whose roof-bar is composed of two elements (7, 8) lapped from the side of rectangular sections (9, 10), and connected b...

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Bibliographische Detailangaben
Hauptverfasser:	KOWALSKI EDWARD, SKRZYNSKI KRZYSZTOF, SITEK JERZY, SURMA ANDRZEJ, RULKA KAZIMIERZ, WERECKI KAZIMIERZ, CHROSTEK JOZEF, PAWELCZYK HENRYK, PEREK JAN, KLUKA JERZY, BREWCZYNSKI KRZYSZTOF, KOZIEL KAROL, SAWKA BOHDAN
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SHAFTS TUNNELS
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